Benchmarking of the NTRM method on octupolar non-linear components at the CERN-SPS synchrotron

The knowledge of the distribution of the nonlinear components in a ring is important for the resonance compensation. A method to measure the lattice nonlinear components based on the nonlinear tune response to a controlled closed orbit deformation (NTRM) was suggested in [1]. First benchmarking of this method was carried out with controlled sextupolar errors in the SIS18 synchrotron at GSI. We present here a further benchmarking of NTRM by using controlled octupolar errors at CERN SPS.